Adjustable chair for tracks



(No Modi.)

W. E. NICK-ERSON.

` ADJUSTABLE CHAIR PoR TRACKS;

No. 311,254. Patented Jan. 27, 1885.

' UNITED STATES PATENT OFFICE.

WILLIAM E. NICKERSON, OF SOMERVILLE, MASSACHUSETTS.

ADJUSTABLE CHAIR FOR TRACKS.

SPECIFICATION forming part of Letters Patent No. 311,254, dated January 27, 1885.

Application filed August 14, 1884.

To aJZ whom t may concern:

Be it known that I, WILLIAM E. NICKER- SON, of Somerville, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Adjustable Chairs for Tracks,ofwhich the following, taken in connection with the accompanying drawings, is a specification.

This invention is particularly adapted for use in saw-mills where it is essential that the carriage shall move with great precision, the object being to so arrange the several parts of the chair that they may be adjusted so as to hold the rail rmly in the eXact position required.

VI attain this object by the mechanism illustrated in the accompanying drawings, in which Figure l isa perspective view of my invention. Fig. 2 is a sectional View of the same.

In the drawings, A represents the rail, which may be of any desired pattern and size. 4C is the bed-piece of the chair, and is made as shown in the drawings. This bed-piece C is ysecurely fastened to the floor of the mill by bolts D, or, in case of a portable mill, to sillpiecesburiedintheground. Thechairproper,

bed-piece C, and is adjusted longitudinally by (No model.)

means of the screwholts E E, and`vertically by the bolts K K. The bolts H H pass through slots h h in the chair B, and clamp it securely to the bed-piece C. (See Fig. 2.) L L represent two set-screws, which serve to fasten the rail A securely in its seat in the chair B.

With this arrangement of parts, the rail A L may be accurately adjusted to any desired position and securely clamped.

This device is particularly useful in case the foundations are liable to settle unevenly. In case the ends of two abutting-rails do not actually coincide, they maybe brought into the desired adjustment by means of the set-screws L L and K K, and there secured by the clamping-screws H H.

I claim as my invention* In a railway-chair, the combination of the stationary bedpiece G with the adjiistable chair proper, B, said chair being provided with adjusting screws E E and K K and clamping-screws H H, all operating together, substantially as described, and for the purpose set forth.

W'ILLIAM E. NICKERSON.

Witnesses:

CHAs. SPAULDING, FRANK G. PARKER. 

